Vacuum cleaner



FIG. 1 is a top, front and left side perspective view of a vacuum cleaner showing our new design;

FIG. 2 is an enlarged perspective view thereof, with the head and tank in FIG. 1 removed;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a rear elevation view thereof;

FIG. 6 is a right side elevation view thereof; and,

FIG. 7 is a top plan view thereof.

The details shown in broken lines form no part of the claimed design. 

The ornamental design for a vacuum cleaner, as shown and described. 